Thread: SR20VE/Nismotronic AFM Voltage Issue

If there was a firmware issue, it would have shown up long before now. I have never heard of anyone having a MAF voltage issue like this.

Right. Did a bit more logging today, added raw AFM voltage on ADC4.

Had some of an improvement from adding a 255 MAF load cell on the fuel map, but obviously I shouldn't really need to do that!

A better log, and then a log with the 255 MAF load are attached.

I had a look at this log. When its doing the high load issue, the maf input voltage is 3.47v and adc4 is reading 2.71v.

Dave i totally understand how many units are out there with the firmware, and its only 3 cars in one country with this issue, but they are all set up and tuned by different people, 1 running a usdm g20 ecu, and 2 running 68c00 n14 ecu (australian delivered), but something really odd is going on. We are trying to test everything we can, earths, mafs, maf placement, we need to remove all items from the issue one at a time to work out why the cars do this!

Cheers
Darryl

Is it safe to assume that all of these logs were taken on a dyno set to hold constant RPM?

Unfortunately the local tuners do not rent dyno time, and refuse to deal with Nismotronic. The logs I've posted have all been recorded on the road

Haha yeah.. any time I mention nismotronic to a tuner shop they just look at me funny

That's unfortunate .. they don't know what they are missing out on!

Dave D directed me to this post earlier and it is something we are going to look into.

I have only seen a few cases on this where the low RPM high load on some VE and all motor setups would cause excessive fueling. We are going to see if we can implement a better way of limiting the low RPM load for the MAF cars. We are going to kick around a few ideas and will keep you guys posted!

There will be dependencies between the two because of the filtering, so there is no surprise there.

For the most part they follow right along with each other with no problem.

You can change the filtering to make it more/less sensitive on throttle input if needed, but that would be a band-aid for sure.

John, ive had 2 Nismotronics ive sold to people take them to Speedtech Motorsport in Wellington NZ, and both times they are been told they wont tune "junk" and upsell to standalone ecu! A good friend of mine is a electronics wiz and has seen the components in a Link ecu, and in his opinion the Link is no faster, if not slower, than a Nissan early 90s ecu. But what can you do.

The Nismotronic system is so good, better than Nistune in my opinion, and for a Sr20 type engine, far better than a empty brain aftermarket ecu. Ive heard a few stories of them coming back from tuner, with a 3 to 4k bill, and only having full power zones tuned, wont cold idle, no temp or baro compensations.

I think the only thing that catches people with Nismotronic is the lack of documentation, people miss things in the setup, eg not knowing how to zoom in on logs, it might be in there somewhere, but you wouldnt stumble upon how to do it. Also boost cut catches a lot of people out from starting with a base file on a NA engine, they wouldnt even think to look in boost control when the car cuts out under load all the time, prob had this 4 or 5 times now with new owners getting really frustrated.

http://www.nismotronic.com/Wiki/doku.php?id=start

I had no idea there was a Wiki....

This is the kind of feedback I need to hear from the end users. All of the info is in the help section of the software on how to zoom/un-zoom and pretty much any of the parameters.

If you have any feedback on how to make it better, I am all ears!

I finally got the web server back in order so I will be updating it with a bunch of base calibrations that should help user's get started.